When the Internet of Things (IoT) came into the field of devices and sensors, it brought extreme changes in how they communicate and share data. In the expansion of IoT devices in various domains, the security and privacy of transmission of voice and video data become crucial. In this research paper, we will examine the development and application of a lightweight algorithm designed to secure voice and video data in IoT. This research examines the challenges of securing real-time voice and video communication within resource-constrained IoT devices. By concentrating on the optimization of encryption algorithms, the study aims to give a balance between security and performance, ensuring that the encryption process does not burden the limited computational resources of IoT devices. The suggested algorithm supports lightweight cryptographic techniques and an efficient way to protect voice and video data during transmission. The research evaluates the algorithm’s effectiveness in security, computational ability, and real-time applicability within IoT devices. This research paper helps us to understand the development, deployment, and performance of the secure lightweight encryption solution for IoT applications. It contributes to the broader discussion on IoT security and provides a practical structure for ensuring the confidentiality and integrity of voice and video data in IoT ecosystems.